title: Modifications and deletions of helices within the hairpin ribozyme-substrate complex: an active ribozyme lacking helix 1.
mesh_terms: D009690:Nucleic Acid Conformation; D017354:Point Mutation; D016337:RNA, Catalytic / Q000235:genetics* / Q000378:metabolism; D017384:Sequence Deletion
chemical_list: D016337:RNA, Catalytic